I learned that kindness can show up at just the right moment.
Like when I was travelling from Israel to Italy on the deck of a cargo/ferry boat and someone saw me buying only a plate of peas to eat and they paid for me to have a full meal. (I was close to zero in cash.) I always remember their kindness.
My lesson is to always help out when I can. I practise this often when I am helping people push broken down cars on the street or giving out food when someone knocks on our car window in traffic.